Detailed observations are presented on the generation and loss of runaway electrons following density limit disruptions in the JET tokamak with carbon limited discharges. Direct observations are made of the runaways from detection of the high energy bremsstrahlung radiation from the runaway - background plasma interactions. The different stages of the disruption leading to the runaway production are identified. It is shown that control of the current channel is important in preventing damaging interactions between the runaways and the vessel walls.